@inbook{NBERc11302,
 Crossref = "NBERfeld80-1",
 title = "Technology and Productivity in the United States",
 author = "Edwin Mansfield and Ruben F. Mettler and David Packard",
 BookTitle = "The American Economy in Transition",
 Publisher = "University of Chicago Press",
 pages = "563-616",
 year = "1980",
 URL = "http://www.nber.org/chapters/c11302",
}
@book{NBERfeld80-1,
 title = "The American Economy in Transition",
 author = "Martin Feldstein",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "1980",
 URL = "http://www.nber.org/books/feld80-1",
}